Carbureter.



Patented May 22,1917.

00 M W--- r w v WM \HIIUH It I l 0 1 j W I. W, II w Swuwwtoz as at 2, to receive State of Michigan,

' ED ST CLARE W. HESS, 0F FLINT,

MICHIGAN, ASSIGNOR OF ONE-HALF TO 01? FOWLERVILLE, MICHIGAN.

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To all whom it may concern:

Be it known that I, CLARE W. Hess, a citizen of the United States of America, residing at Flint, in the county of Genesee and have invented certain new and useful Improvements in Carbureters, of which the following is a specifica tion, reference being had therein to the accompanying drawings.

This invention relates to carbureters, and invention aims to provide a carbureter wherein the parts are constructed with a view of reducing the cost of manufacture, and at the same time retain the features by which durability, simplicity of construction, and ease of assemblingare secured and with such ends in view, my invention resides in the novel construction to be hereinafter described and thenclaimed.

"Reference will now be had to the drawings, wherein- I Figure 1 is a vertical longitudinal sectional view of the carbureter in accordance with my invention; I

Fig. 2 is an elevation of adetached slide valve; I

Fig. 3 is a plan of the same, and

Fig. 4 is a plan of a floatlever. v

In the drawing, 1 denotes a vertically disposed tubular carbureter body having the upper ends thereof interiorly screwthreaded, the threaded portion 3 of an intake manifold connection 4*. In this connection is a butterfly valve or throttle'4 on a shaft 5 which extends transversely of the upper end of the body 1 and edportion, 3 of the connection 4, consebureter is practically is an air intake colinection 7 quently the carbureter cannot be removed from the manifold connection without removing the throttle shaft 5, and it. is in this connection that this portion of the carfool proof.

At one side of the lower end of the body 1 provided with a butterfly valve or throttle 8, and at the opposite side of the body 1 is a float chamber 9 provided with a detachable cover 10. As a matter of good construction, the air intake connection 7 and the float chamber 9 are formed integral with the lower end of the body 1, and easy access can be had to the body 1, the connection 7 and the float chamber 9- for assembling parts of the carburetel Specification of Letters Patent.

the thread- Patented May 22, 1917.

- Application filed April14,1916. Serial No. 91,022. 4

The bottom of the float chamber 9 has an enlargement 11, extending into the bottom GEORGE L. ADAMS,

of the body. 1, and said enlargement is drilled or bored to provide a longitudinal port 12, one end of which terminates axially of the carbureter body 1, and the opposite end of which is provided with a detachable plug 13. The port 12 is in communication with a port 14 axially of the float chamber 9 and this port 14 affords a heedle valve seat,

as will'presently appear. The port 12 also communicates with'a stand pipe 15 mounted in the enlargement within the carbureter body 1, and said standpipe extends through an angle passage 16 which is in communication with a Venturi tube 17 mounted upon the enlargement within the bottom of the carbureter body. The Venturi tube 17 surrounds the standpipe 15 and extends a slight distance above the upper end of said pipe.

Slidable in the carbureter body 1, between the manifold connection 4 and theVenturi tube 17 is an automatic sleeve valve18 having the lower edges thereof beveled as at 19,

to seat upon a conical portion 20 of the Venturi tube 17 and close the communication between the body 1 and the air intake connection 7 around the Venturi tube 17. Theupper end of the automatic sleeve valve 18 is provided with a-spider'or transverse bar 21 having a depending conical or needle valve 22 adapted to extend into the upper end 23 of the standpipe 15 and control the communication between the float chamber 9 and the carbureter body 1.

The cover 10 of the flo'at chamber 9 is provided with an adjustable high speed valve 24 extending, into the port 14 of the enlargement 11 and adapted to control the communication between the port 12 and the float chamber 9. The high speed needle valve 24 loosely guides a hollow float 25 within the chamber 9, and loosely engaging the top of the float 25 and surrounding the high speed valve 24 is the end of a float lever 26. The opposite end of the float lever 26 is loosely held, as at 27, at the inner end of a gasolene inlet connection 28 and the supply of gasolene to said float chamber is controlled by a needle float valve 29 and loosely connected to the float lever 26.

The high speed needle valve 24 having been properly set, and gasolene entering the connection 28, the gasolene accumulates in the floatchamber 9, the port 12 and the standpipe 15, to a height of about one-sixv teenth of an inch below the top of the standpipe, at which time the buoyant float 25 elevates the lever 26 and the needle valve 29, thereby shutting off the supply of gasolene until gasolene has been used from the float chamber 9.

The normal position of the automatic slide valve 18 has been shown by dotted lines in Fig. 1, where it will be observed that the automatic slide valve is seated upon the Venturi tube and that the conical needle valve 22 is not completely seated relative to the upper end of the standpipe 15. When the automatic slide valve is in this position, the

I communication between the carbureter body valve,

the sides ofthe carbureter dense.

1 and the air intake connection 7 is shut ofl', except for the small air passage 16 into the Venturi tube 17 and around the standpipe 15. The conical needle valve 22 constitutes a low speed needle valve and as the suction of a motor running at low speed causes air to be drawn through the Venturi tube 17 and past the upperend of the standpipe 15, the gasolene is completely atomized as it is drawn into the carbureter body. The Venturi tube 17 constitutes a primary air supply which allows air to pass the upper end of the standpipe at a high velocity, and as the low speed needle valve 22 is supported by a spider, the admixture of air and gasolene can easily pass up through the carbureter body 1.

As the throttle valve 4 is opened and the engine is speeded up, the additional suction of the motor lifts the slide valve 18 off of the seat 20 of the Venturi tube 17 permitting more air to pass through the slide as the lower end of the slide valve is opened in direct communication with the air intake 7. As the slide valve 18 rises off of its seat 'the low speed needle valve is carried with it permitting the full flow of gasolene from the standpipe 15. As both the primary and auxiliary air supplies completely surround the gasolene leaving the upper end of the standpipe 15, there isno opportunity for the gasolene vapor to strike bodyand con- The automatic slide valve 18 is very sensitive and will float at various heights in the rising current of the mixture, depending on the speed of the engine.

. valve descends by gravity and has no springs or levers attached to malntain a constant pressure or resistance to the auxiliary air, it is possible to maintain a of air at a high velocity through the primary air tube, at all speeds. When the throat of the automatic slide valve rises above the Venturi tube, more air in proportion to the gasolene vapor, is drawn in, thus Since the slide uniform suction able at high speed. If the engine is slowed down, the automatic slide valve lowers and cuts off the supply of auxiliary air and increases the richness of the mixture, which is necessary at a low speed. I

From the foregoing it will be observed that a carbureter in accordance with my invention is characterized by the following advantages.

First, the high velocity of air around the gasolene inlet nozzle at all speeds insures complete atomization of the fuel and this is accomplished with a single gasolene jet or nozzle located centrally of the air passage. Second, the supplying of a rich mixture, if the throttle is suddenly opened, to make a quick get away, as the gasolene nozzle is completely opened when the automatic slide valve is raised for the fraction of an inch, while the air supply is limited until the automatic slide valve has reached the height shown by full lines in the drawings. Third, with no openings or adjustments on the bottom of the carbureter, it can be set low, avoid leakage, and easy inspection of the parts can be accomplished by simply removing the cover of the float chamber, and

Fourth, automatically increases the proportion of gasolene to air on low speed and increases the proportion of air to gasolene on high speed.

The above are a few of the advantages attained by the carbureter construction, and while in the drawing there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

What 1 claim is 1. A carbureter comprising a body having the lower end thereof provided with an air intake connection, a float chamber at the lower end of said body, a float in said chamber, a standpipe in the lower end of said body in communication with said float chamber, a high speed needle valve axially of said float and float chamber operable independent of said float controlling the supply of gasolene to said standpipe, a Venturi tube in the lower end of said body surrounding said standpipe, a slide valve in said body adapted to seat on said Venturi tube and shut off the main supply of air to said carbureter body, and a valve forming part of said slide valve and adapted to cooperate plosive mixture into said body, a float in nularropening adapted to discharge air upsaid chamber, an inlet valve controlled Wardly against said tube. 10 thereby, a high speed needle valve extending In testimony whereof I aflix my signature through said float and controlling the comin the presence of tWo Witnesses.

5 munication between said chamber and said CLARE W. HESS.

Venturi tube independent of said inlet valve, Witnesses: and a slide valve in said body cooperating G. L. CLAWsoN,

with said tube in providing a variable an- Mrs. WM. WARNER. 

